These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Oh, I'll give you a magazine, there buddy. Hey, it's full of hollow points. You're gonna love it when I put those in a gun, and then put 'em in your brain!
Master Shake turning black and trying out his new "complicated handshake."
This interaction between Shake and a store clerk:
Clerk: Look, uh. We don't cash checks here.
Master Shake: And we don't respond to threats! I'll say it one more time in that little language I like to call English. Or maybe I should say it in Mexican-o? Get back there-o and cash-o the check-o, amigo. Andale, Andale.
Ignignokt: He's not responding, cup. Lay into him more.
Err: (outside with the giant radioactive "check"note actually a bill) Yeah, lay into him some more!
Ignignokt: I've got this, Err.
Clerk: That thing there is your check?
Master Shake: Yeah, that's the check.
Clerk: Well, we don't cash 'em.
Master Shake: Oh, you've never seen a check before? Oh, me so sorry. Maybe you're in the wrong business. And maybe immigration would like to know about this.
Clerk: Good.. cause I'm American.
Master Shake: Well I'm not! But when I become one, maybe then I'll legally buy a weapon and we won't have to vote you out of office. Will we, scumbag?!
"We are not establishing a democracy in this house! This is a dictatorship! I rule with an iron dick!"
"Yeah, I'm in the business. The business of kickin' your ass. And lemme tell ya, business is boomin'."
Carl: There's something I need to say, ya know. Ever since my son was...never conceived because I never had consensual sex without money involved, I always sorta looked at you as...well, kind've a thing that I could, ya know, live next to in accordance with state law.
Meatwad: Oh, that's sweet. You're trying to say that you love me!
Carl: Eh eh eh, let's not get ahead of ourselves here - WHO ARE YOU TAKIN' TO THAT FRIGGIN SUPERBOWL!
Rewatch Bonus: All the numerous hints at Frylock being a lesbian trapped in a man's body as a box of fries become a lot more noticeable once you've seen The Movie.
Seasonal Rot - Episodes from season 4 and beyond for the most part haven't been well-received by fans, though the episodes that aired when the show changed its name to "Aqua Unit Patrol 1" and "Aqua Something, Something, You Know Whatever" are considered a return to the good old days of seasons one to three.